US6147483A - Variable color digital voltmeter with analog comparator - Google Patents

Variable color digital voltmeter with analog comparator

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Publication number
US6147483A
US6147483A US09335551 US33555199A US6147483A US 6147483 A US6147483 A US 6147483A US 09335551 US09335551 US 09335551 US 33555199 A US33555199 A US 33555199A US 6147483 A US6147483 A US 6147483A
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Prior art keywords
color
background
signal
display
analog
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Expired - Fee Related
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US09335551
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Karel Havel
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Texas Digital Systems Inc
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Texas Digital Systems Inc
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00Arrangements for displaying electric variables or waveforms
    • G01R13/02Arrangements for displaying electric variables or waveforms for displaying measured electric variables in digital form
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00Arrangements for displaying electric variables or waveforms
    • G01R13/40Arrangements for displaying electric variables or waveforms using modulation of a light beam otherwise than by mechanical displacement, e.g. by Kerr effect
    • G01R13/404Arrangements for displaying electric variables or waveforms using modulation of a light beam otherwise than by mechanical displacement, e.g. by Kerr effect for discontinuous display, i.e. display of discrete values
    • G01R13/405Arrangements for displaying electric variables or waveforms using modulation of a light beam otherwise than by mechanical displacement, e.g. by Kerr effect for discontinuous display, i.e. display of discrete values using a plurality of active, i.e. light emitting, e.g. electro-luminescent elements, i.e. bar graphs
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B5/00Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
    • G08B5/22Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
    • G08B5/36Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09FDISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/04Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/04Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/06Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources
    • G09G3/12Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources using electroluminescent elements
    • G09G3/14Semiconductor devices, e.g. diodes
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • G09G5/04Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed using circuits for interfacing with colour displays

Abstract

A digital measuring device of the invention simultaneously exhibits the measured value of an analog signal, by digital indication, and its relation to an analog limit, by color of the digital indication. The measuring device includes an analog comparator, for comparing the value of the analog signal with the analog limit and for developing a comparison accordingly, and a digital measuring device, for converting the measured value of the analog signal to digital data, which are digitally exhibited on a variable color light emitting diode digital display device. The comparison signal is applied to a color control input of the display device, for controlling the color of the digital indication in accordance with the relation of the value of the analog signal to the analog limit.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This is a division of my application Ser. No. 08/721,719, filed on Sep. 27, 1996, now U.S. Pat. No. 5,963,185, entitled Display Device with Variable Color Background Area, which is a division of my application Ser. No. 08/422,090, filed on Mar. 31, 1995, entitled Digital Color Display System, now U.S. Pat. No. 5,561,365 issued on Oct. 1, 1996, which is a division of my application Ser. No. 08/099,411, filed on Jul. 30, 1993, entitled Method of Measuring and Indicating, now abandoned, which is a division of my application Ser. No. 07/767,792, filed on Sep. 30, 1991, entitled Method of Measuring and Indicating, now abandoned, which is a division of my application Ser. No. 07/528,229, filed on May 24, 1990, entitled Measuring Device with Variable Color Display, now U.S. Pat. No. 5,057,768 issued on Oct. 15, 1991, which is a division of my application Ser. No. 07/337,410, filed on Apr. 13, 1989, entitled Digital Voltmeter with Variable Color Background, now abandoned, which is a division of my application Ser. No. 06/940,100, filed on Dec. 10, 1986, entitled Digital Voltmeter with Variable Color Background, now U.S. Pat. No. 4,831,326 issued on May 16, 1989, which is a continuation-in-part of my application Ser. No. 06/882,430, filed on Jul. 7, 1986, entitled Display Device with Variable Color Background, now U.S. Pat. No. 4,734,619 issued on Mar. 29, 1988.

This also relates to my application Ser. No. 06/922,847, filed on Oct. 24, 1986, entitled continuously Variable Color Display Device, now U.S. Pat. No. 4,845,481 issued on Jul. 4, 1989, to my application Ser. No. 07/322,341, filed on Mar. 13, 1989, entitled Continuously Variable Color Optical Device, now U.S. Pat. No. 4,965,561 issued on Oct. 23, 1990, and to my application Ser. No. 06/929,625, filed on Nov. 12, 1986, entitled Variable Color Digital Display Device, now U.S. Pat. No. 4,771,274 issued on Sep. 13, 1988.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to measuring devices utilizing a variable color display.

2. Description of the Prior Art

Commercially available measuring instruments with monochromatic digital readout are capable of performing measurements and displaying results at a relatively fast rate. However, to determine a significance of each measured value, an operator must rapidly read displayed values and perform mental comparisons with predetermined limits. The task is much more complicated when the limits are variable.

A system for measuring radioactivity is described in U.S. Pat. No. 2,643,344, issued on Jun. 23, 1953 to Ian H. McLaren et al. Another systems for measuring radioactivity are described in U.S. Pat. No. 2,648,015 issued on Aug. 4, 1953 to Alexander Greenfield et al., and in U.S. Pat. No. 2,682,000 issued on Jun. 22, 1954 to Joseph F. Clayton et al. Since these three patents are very similar, they are equally authoritative. The system for measuring radioactivity, disclosed in the three patents, includes an analog pointer indicator having three scales, with three associated colored light bulbs, for indicating which scale is applicable for the reading of the measured value. A mechanism for automatic range selection is provided, which is controlled by two solenoids, and which also controls the three associated colored light bulbs. In response to the range selection, one of the light bulbs illuminates the indicator face with a distinctive color to indicate which measurement scale is applicable. After each measurement, the operator must evaluate each measured value to determine its significance, mentally or otherwise.

A digital meter is disclosed in U.S. Pat. No. 2,889,518, issued on Jun. 2, 1959 to Harold R. Hudson et al. The digital meter includes a motor, a wheel counter rotatable by the motor, a potentiometer rotatable by the motor, and a mechanical sampler (vibrator). An unknown voltage is compared, by the sampler, with an instant reference voltage that appears on the wiper of the potentiometer. The motor keeps rotating the potentiometer until the unknown voltage is equal to the reference voltage. The rotation of the motor is then automatically stopped, which also stops the wheel counter, whose position numerically indicates the value of the measured voltage. The decimal point monochromatic lamps are placed between the wheels of the counter. One of the decimal point lamps is illuminated, by manually operated range switch, to indicate by its position the selected measurement range.

The prior art does not contemplate a digital voltmeter capable of automatically evaluating the measured value. The prior art does not contemplate a digital voltmeter capable of automatically indicating a significance of the exhibited measured value, by color. The prior art does not contemplate an analog comparator for automatically comparing the value of an analog measured signal with an analog limit, to determine their relation.

SUMMARY OF THE INVENTION

Accordingly, it is the principal object of this invention to provide an improved variable color digital voltmeter.

It is another object of the invention to provide a digital voltmeter utilizing a variable color light emitting diode display.

It is still another object of the invention to provide a digital voltmeter capable of automatically evaluating the measured value, to determine its significance.

It is still another object of the invention to provide a digital voltmeter including an analog comparator for comparing the measured analog signal with an analog limit, to automatically determine whether the measured value is less than the limit or more than the limit.

It is still another object of the invention to provide a digital voltmeter including two analog comparators for respectively comparing the measured analog signal with two analog limits, to automatically determine whether the measured value lies within the limits or outside the limits.

It is still another object of this invention to provide a digital voltmeter capable of controlling the color of the digital indication of the measured value, to indicate whether it lies within or without the predetermined analog limits.

In summary, a measuring device of the invention includes an analog comparator for comparing the value of an input analog signal with an analog limit and for developing a first comparison signal when the value of the analog signal is less than the analog limit and a second comparison signal when the value of the analog signal is greater than the analog limit. A digital indication of the measured value of the analog signal is exhibited on a variable color light emitting diode digital display device, which includes a color control input for controlling the color of the digital indication.

The invention resides in applying the comparison signal developed by the analog comparator to the color control input, for controlling the color of the digital indication accordingly. The invention thus provides a new and unexpected result: the operator does not need to examine those measured values that are indicated, by color, as being insignificant.

Further objects of the invention will become obvious from the accompanying drawings and their description.

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings in which are shown the preferred embodiments of the invention,

FIG. 1 is a block diagram of a digital voltmeter with a variable color display.

FIG. 2 is a block diagram of a variable color digital voltmeter with an analog comparator.

FIG. 3 is a block diagram of a variable color digital voltmeter with a digital comparator.

FIG. 4 is a simplified schematic diagram of a digital voltmeter of the invention.

FIG. 5 is an exemplary detail of the display on which measured result is displayed in yellow color on green background.

FIG. 6 is a similar detail of the display on which measured result is displayed in yellow color on blue background.

FIG. 7 is a similar detail of the display on which measured result is displayed in yellow color on red background.

FIG. 8 is a simplified schematic diagram of one element of a variable color display device.

FIG. 9 is a cross-sectional view, taken along the line A--A in FIG. 6, revealing internal structure of a portion of a variable color display device.

FIG. 10 is a schematic diagram of an analog comparator for developing color control signals.

FIG. 11 is a schematic diagram of a digital comparator for developing color control signals.

FIG. 12 is a detail of 13-bit digital comparator in FIG. 11.

Throughout the drawings, like character indicate like parts.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring now, more particularly, to the drawings, in FIG. 1 is shown a block diagram of a digital voltmeter utilizing a variable color display surrounded by a variable color background area. The digital voltmeter includes an A/D (analog to digital) converter 51, for converting an analog signal Vin applied to its input to digital data, and a display decoder 23 for causing the digital data to be displayed in a character format on a variable color display 11, in a manner well known to those skilled in the art. As will be more specifically pointed out subsequently, the display 11 includes variable color display areas arranged in a pattern and integral variable color background area. The invention resides in the addition of a segment color control 21 for illuminating the display areas in a suitable color and a background color control 22 for illuminating the background area in a color related to the measured value. The digital voltmeter of this invention can thus simultaneously indicate the measured value, in a character format, and its significance, in a color of the display background. By way of an example, measured value that is considered to be normal may be indicated on green background, measured value that is slightly abnormal may be indicated on blue background, and measured value that is critical may be indicated on red background.

In FIG. 2 is shown a block diagram of a like digital voltmeter characterized by an analog comparator 81. The input of analog comparator 81 is coupled to the input of A/D converter 51 for comparing the input signal with predetermined limits and for developing comparison signals accordingly. The background color control 22 illuminates the background area of the display in accordance with the comparison signals.

In FIG. 3 is shown a block diagram of a like digital voltmeter characterized by a digital comparator 84. The input of digital comparator 84 is coupled to the output of A/D converter 51 for comparing the output digital data with predetermined limits and for developing comparison signals accordingly. The background color control 22 illuminates the background area of the display in accordance with the comparison signals.

In FIG. 4 is shown a schematic diagram of a digital voltmeter of this invention which includes a DVM (digital voltmeter) chip 53 for measuring input signal Vin applied, via a resistor 90a and decoupling capacitor 93a, to its HI (high) and LO (low) inputs, and for developing segment drive signals a, b, c, d, e, f, g, and DP (decimal point) for a 31/2 digit variable color display 41 on which measured values of the input signal may be indicated in a character format. Resistor 90b and capacitor 93b, coupled to input OSCILLATORS, are provided for selecting a suitable frequency of internal oscillators. An auto zero capacitor 93c tends to decrease noise. Integrating capacitor 93d and buffer resistor 90c provide desired voltage swing and linearity.

The first display element of the display 41 consists of a figure `1` and a minus sign. The second, third, and fourth display elements consist of seven segments arranged in a well known 7-segment font on which selected characters may be exhibited in variable color. In the second element, the segments are designated as 31a, 31b, 31c, 31d, 31e, 31f, and 31g. Each display element has three color control inputs R (red), G (green), and B (blue) designated DISPL. Each display element is surrounded by a variable color background area, as will be more clearly pointed out subsequently. The background area of each display element also has three color control inputs R, G, and B designated as BACK. It is obvious from the illustration that the color control inputs of the display elements and background areas are respectively interconnected to form DISPLAY BUSES R, G, and B, for controlling color of all display elements uniformly, and BACKGROUND BUSES R, G, and B, for controlling color of the entire background 32 area uniformly.

FIGS. 5 to 7 are examples of displayed measured values which consider exemplary low limit -1.5 and high limit 1.5 (in Volts or in any other suitable units). The invention resides in controlling the color of background area 32 to indicate whether the measured value lies within the bounds of the low and high limits, below the low limit, or above the high limit. FIG. 5 shows a display on which a measured value 1.234 is displayed on green background, to indicate that it lies within the bounds of the low and high limits. FIG. 6 shows a display on which a measured value -1.789 is displayed on blue background, to indicate that it lies below the low limit. FIG. 7 shows a display on which a measured value 1.956 is displayed on red background, to indicate that it lies above the high limit. To render the illustration less complex, all measured values are displayed in yellow color. It will be appreciated that the color of the display may be also varied, to enhance the presentation, as described in more detail in the above identified copending application.

It is readily apparent that the method of displaying measured values shown in FIGS. 5 to 7 is extremely advantageous. Being completely surrounded by the background area 32, all display elements of the display 41 are distinctly associated therewith. It is perfectly clear that the color of the background area relates only to the values exhibited on the display elements within its boundaries, and not to values exhibited on display elements which may be located outside the boundaries.

Proceeding now to the detailed description, in FIG. 8 is shown a simplified schematic diagram of a one-character 7-segment variable color display element with variable color background. Each display segment of the display element includes a triad of closely adjacent LEDs: a red LED 1, green LED 2, and blue LED 3 which are adapted for producing a composite light signal of a variable color. To facilitate the illustration, the LEDs are designated by segment letters, e. g., red LED in the segment b is shown at 1b, green LED in the segment d is shown at 2d, and blue LED in the segment f is shown at 3f. The background area is comprised of background regions adjacent the display segments. Each background region includes a triad of closely adjacent LEDs: a red LED 4, green LED 5, and blue LED 6 which are adapted for producing a composite light signal of a variable color. As much as possible, the LEDs in the background regions are designated by letters of adjacent display segments.

The cathodes of all red, green, and blue display LED triads are interconnected in each display segment and electrically connected to respective inputs a, b, c, d, e, f, g, and DP (decimal point) which may be coupled to the outputs of DVM chip 53 viewed in FIG. 4. The anodes of all display red LEDs 1a, 1b, 1c, 1d, 1e, 1f, 1g, and 1i are commonly coupled to an electric path referred to as a display red bus 12. The anodes of all display green LEDs 2a, 2b, 2c, 2d, 2e, 2f, 2g, and 2i are commonly coupled to a like electric path referred to as a display green bus 13. The anodes of all display blue LEDs 3a, 3b, 3c, 3d, 3e, 3f, 3g, and 3i are commonly coupled to a like electric path referred to as a display blue bus 14.

In a similar fashion, the anodes of all background red LEDs 4a, 4b, 4c, 4d, 4e, 4f, 4g, and 4h are commonly coupled to an electric path referred to as a background red bus 16. The anodes of all background green LEDs 5a, 5b, 5c, 5d, 5e, 5f, 5g, and 5h are commonly coupled to a like electric path referred to as a background green bus 17. The anodes of all background blue LEDs 6a, 6b, 6c, 6d, 6e, 6f, 6g, and 6h are commonly coupled to a like electric path referred to as a background blue bus 18. The cathodes of all red, green, and blue LED triads in each background region are grounded.

The display red bus 12 is connected to the output of a non-inverting buffer 25a capable of sourcing sufficient current to illuminate all display red LEDs. The display green bus 13 is connected to the output of a like buffer 25b. The display blue bus 14 is connected to the output of a like buffer 25c. The background red bus 16 is connected to the output of a like buffer 25d. The background green bus 17 is connected to the output of a like buffer 25e. The background blue bus 18 is connected to the output of a like buffer 25f. It would be obvious to those skilled in the art that current limiting resistors may be connected in series with all LEDs in the circuit to constrain current flow.

The operation of the display element shown in FIG. 4 will be now explained on example of illuminating digit `1` in yellow color. To exhibit decimal number `1`, low voltage levels are applied to the inputs b and c, to illuminate equally designated segments, and high voltage levels are applied to all remaining inputs, to extinguish all remaining segments.

To illuminate the display element in yellow color, the color control inputs R and G of the display buses are raised to a high logic level, while color control input B is maintained at a low logic level. As a result, the outputs of buffers 25a and 25b rise to a high logic level. The current flows from the output of buffer 25a, via display red bus 12 and red LED 1b, to the input b, and, via red LED 1c, to the input c. The current also flows from the output of buffer 25b, via display green bus 13 and green LED 2b, to the input b, and, via green LED 2c, to the input c. As a result of blending light signals of red and green colors in the segments b and c, the segments illuminate in substantially yellow color, creating a visual impression of a character `1`.

To illuminate the background area in green color, the color control input G of the background buses is raised to a high logic level, while the remaining color control inputs R and B are low. As a result, the output of buffer 25e rises to a high logic level. The current flows therefrom, via background green bus 17 and green LEDs 5a, 5b, 5c, 5d, 5e, 5f, 5g, and 5h in all background regions, to ground. The entire background area illuminates in green color.

To illuminate the background area in blue color, the color control input B of the background buses is raised to a high logic level, while the remaining color control inputs R and G are low. As a result, the output of buffer 25f rises to a high logic level. The current flows therefrom, via background blue bus 18 and blue LEDs 6a, 6b, 6c, 6d, 6e, 6f, 6g, and 6h in all background regions, to ground. The entire background area illuminates in blue color.

To illuminate the background area in red color, the color control input R of the background buses is raised to a high logic level, while the remaining color control inputs G and B are low. As a result, the output of buffer 25d rises to a high logic level. The current flows therefrom, via background red bus 16 and red LEDs 4a, 4b, 4c, 4d, 4e, 4f, 4g, and 4h in all background regions, to ground. The entire background area illuminates in red color.

An important consideration has been given to physical arrangement of the LEDs in the display areas and background regions, as illustrated in FIG. 9. Display red LED 1f, green LED 2f, and blue LED 3f are disposed on a support 10 in a display light blending cavity 8f and completely surrounded by transparent light scattering material 34. When forwardly biased, the LEDs 1f, 2f, and 3f emit light signals of red, green, and blue colors, respectively, which are blended by passing through light scattering material 34, acting to disperse the light signals, to form a composite light signal that emerges at the upper surface 35f. The color of the composite light signal may be controlled by varying the portions of red, green, and blue light signals. Display red LED 1b, green LED 2b, and blue LED 3b are similarly disposed in a display light blending cavity 8b and may be similarly activated.

In a similar fashion, background red LED 4g, green LED 5g, and blue LED 6g are disposed on the support 10 in a background light blending cavity 9g and surrounded by transparent light scattering material 34. When forwardly biased, the LEDs 4g, 5g, and 6g emit light signals of red, green, and blue colors, respectively, which are blended by passing through the light scattering material 34 to form a composite light signal of a composite color that emerges at the upper surface 36g.

The display light blending cavities are optically separated from adjacent background light blending cavities by opaque walls. The display light blending cavity 8f is defined by walls 7a and 7b. The walls have generally smooth inclined surfaces defining an obtuse angle with the support 10. The walls 7b and 7c similarly define a background light blending cavity 9g therebetween. In a similar fashion, the display light blending cavity 8b is defined by the walls 7c and 7d. The width of the top surfaces of the opaque walls is uniform and distinctly less than the width of the display areas or background regions so as to minimize the boundaries therebetween. The top surfaces of the opaque walls and top surfaces of the display areas and background regions are in the same plane to allow wide angle observation of the display device. Although the walls and light blending cavities are shown to be of certain shapes and dimensions, it is envisioned that they may be modified and rearranged.

In FIG. 10, the input signal Vin is applied to the interconnected inputs of two analog comparators 82a, 82b in a classic `window` comparator configuration. When the input voltage is lower than the low voltage limit Vlo, set by a potentiometer 92a, the output of comparator 82a drops to a low logic level, thereby forcing the output of an inverter 65a to rise to a high logic level to develop active color control signal B.

When the input voltage is higher than the high voltage limit Vhi, set by a potentiometer 92b, the output of comparator 82b drops to a low logic level, thereby forcing the output of an inverter 65b to rise to a high logic level to develop active color control signal R.

When the input voltage is between the low voltage limit Vlo and high voltage limit Vhi, the outputs of comparators 82a, 82b rise to a high logic level (pull-up resistors 91a, 91b ensure correct high and low levels), thereby causing the output of AND gate 66 to rise to a high logic level to develop active color control signal G. The outputs B, G, and R may be respectively coupled to like inputs of the background buses in FIG. 4 to cause the background area 32 to illuminate in one of three colors in accordance with the range in which the measured voltage lies.

In FIG. 11 is shown a schematic diagram of a digital voltmeter with a comparator for developing color control signals. A DVM chip 54 measures input signal Vin applied via a resistor 90f to its input IN and develops at its outputs A, B, C, D of Units, Tens, Hundreds, and Thousand digital data corresponding to the value of measured input signal. The input INIT CONV (initiate conversion) is tied to a high logic level for causing the DVM chip to measure continuously. The output digital data are simultaneously applied to the inputs A0 to A12 of a 13-bit digital comparator 85a and to the inputs A0 to A12 of a like comparator 85b. Two 8-bit latches 63a, having its outputs Q0 to Q7 respectively coupled to the inputs B0 to B7 of comparator 85a, and 63b, having its outputs Q0 to Q4 respectively coupled to the inputs B8 to B12 of comparator 85a, are provided for storing a digital representation of a low limit. Two like latches 63c, having its outputs Q0 to Q7 respectively coupled to the inputs B0 to B7 of comparator 85b, and 63d, having its outputs Q0 to Q4 respectively coupled to the inputs B8 to B12 of comparator 85b, are provided for storing a digital representation of a high limit. The comparator 85a effects a comparison of the output digital data with the low limit and develops comparison signals accordingly. The comparator 85b effects a comparison of the output digital data with the high limit and develops comparison signals accordingly. It would be obvious that data in the latches may be readily changed by applying new data to the inputs D0 to D7 and clocking same into the latches (not shown).

When the output digital data of DVM chip 54 are less than the low limit, the output `<` of comparator 85a rises to a high logic level to generate an active color control signal B. When the digital data are greater than the high limit, the output `>` of comparator 85b rises to a high logic level to generate an active color control signal R. When the digital data are within the bounds of the low and high limits, one of the outputs `=` and `>` of comparator 85a, which are gated by an OR gate 60a, and one of the outputs `<` and `=` of comparator 85b, which are gated by an OR gate 60b, rise to a high logic level to force both inputs of an AND gate 66b to rise to a high logic level. As a consequence, the output of OR gate 66b rises to a high logic level to generate active color control signal G. The comparison outputs B, G, and R may be respectively coupled to like inputs of the background buses in FIG. 4 for causing the background area 32 of the display 41 to illuminate either in blue color when the measured value is less than the low limit, in red color when the measured value is greater than the high limit, or in green color when the measured value is within the bounds of the low and high limits. It would be obvious that the color sequences could be readily changed by differently interconnecting the comparison outputs with the background color control inputs.

FIG. 12 is a detail of one of 13-bit digital comparators 85a, 85b in FIG. 11. It will be appreciated that both digital comparators 85a, 85b may be substantially same. The comparison inputs `<`, `=`, and `>` of four 4-bit digital comparators 86a, 86b, 86c, and 86d are respectively coupled to like preceding outputs, in a manner well understood by those skilled in the art, to extend the comparison range to 13 bits.

The invention may be now briefly summarized. A measuring device was disclosed which comprises an input for receiving an analog signal and an analog comparator for comparing the value of the analog signal with an analog limit and for developing a comparison signal accordingly. The analog signal is also digitally measured and converted to digital data indicative of the measured value of the analog signal. The measuring device also includes a variable color light emitting diode digital display device for providing a digital indication of the digital data. The display device includes a color control input for controlling the color of the digital indication. The invention resides in the provision of a color control for applying the comparison signal to the color control input for illuminating the digital indication in accordance with the relation of the value of the analog signal to the analog limit.

It would be obvious, in the view of the present disclosure, that the hardware design of the present invention may be also implemented by software. It would be further obvious that persons skilled in the art may resort to modifications in the construction of the preferred embodiments shown herein, without departing from the scope, as defined in the appended claims, and the spirit of the invention. It is contemplated that the principles of the invention may be also applied to numerous diverse types of display devices, such as liquid crystal devices, plasma devices, luminescent devices, cathode ray tube devices, and the like.

Correlation Table

This is a correlation table of reference characters used in the drawings herein, their descriptions, and examples of commercially available parts.

______________________________________#        DESCRIPTION         EXAMPLE______________________________________ 1       display red LED 2       display green LED 3       display blue LED 4       background red LED 5       background green LED 6       background blue LED 7       opaque wall 8       display light blending cavity 9       background light blending cavity10       support11       variable color display12       display red bus13       display green bus14       display blue bus16       background red bus17       background green bus18       background blue bus21       segment color control22       background color control23       display decoder25       non-inverting buffer                        74LS24431       display segment32       background area34       light scattering material35       top surface of display area36       top surface of background area41       31/2 digit variable color display51       A/D converter53       Teledyne DVM chip   TSC710754       Teledyne DVM chip   TSC875060       2-input OR gate     74HC3263       8-bit latch         74HC37365       inverter            74HC0466       2-input AND gate    74HC0881       analog comparator82       analog comparator chip                        LM33984       digital comparator85       13-bit digital comparator86       4-bit digital comparator                        74HC8590       resistor91       resistor92       potentiometer93       capacitor______________________________________

The examples of the parts should be considered as merely illustrative. It will be appreciated that other parts may be readily and effectively used.

Claims (8)

What I claim is:
1. A measuring device comprising:
a signal input for receiving an analog signal;
a first analog comparator and a second analog comparator coupled to said signal input for respectively comparing said analog signal with a low analog limit and a high analog limit and for developing a first comparison signal when the value of said analog signal is within said low analog limit and said high analog limit, a second comparison signal when the value of said analog signal is less than said low analog limit, and a third comparison signal when the value of said analog signal is greater than said high analog limit;
means for measuring said analog signal and for developing digital data indicative of the measured value of said analog signal;
a variable color light emitting diode digital display device coupled to said means for measuring for providing a digital indication of said digital data, said display device including a first color control input for receiving a first color control signal, for illuminating said digital indication in a first color, a second color control input for receiving a second color control signal, for illuminating said digital indication in a second color, and a third color control input for receiving a third color control signal, for illuminating said digital indication in a third color; and
a color control coupled to said digital display device for applying to said first color control input said first color control signal, when said first comparison signal is developed, for applying to said second color control input said second color control signal, when said second comparison signal is developed, and for applying to said third color control input said third color control signal, when said third comparison signal is developed.
2. A measuring device comprising:
a signal input for receiving an analog signal;
an analog comparator including a comparator input, responsive to said analog signal, for comparing the value of said analog signal with an analog limit, and a comparator output, for developing a comparison signal in accordance with the relation of said value of said analog signal to said analog limit;
a display device having a relatively flat display surface and including a plurality of adjacent display elements, each said display element including a plurality of light emitting diodes arranged in a pattern for exhibiting, when selectively forwardly biased, a plurality of characters;
a plurality of variable color background areas, equal in number to the number of said display elements, each said background area having a substantially flat surface aligned with said flat display surface, said background area substantially surrounding one of said display elements and including a plurality of background regions, each said background region including a plurality of light emitting diodes for emitting, when forwardly biased, light signals of respective primary colors and means for combining said light signals in said background region to obtain a light signal of a composite color;
each said background area including a plurality of background color control inputs, equal in number to the number of said primary colors, to which said light emitting diodes in all its background regions are commonly coupled in accordance with their colors, for being selectively forwardly biased in accordance with a color control signal applied to said background color control inputs, for accordingly illuminating in one of said primary colors and said composite colors;
means for respectively interconnecting said background color control inputs of all said background areas;
means for measuring including a measurement input, coupled to said signal input for measuring said analog signal, and a plurality of data outputs coupled to said light emitting diodes in each said display element in accordance with their positions in said pattern, for producing selective data output signals in accordance with the measured value of said analog signal, for forwardly biasing certain ones of said light emitting diodes in each said display element, for exhibiting a multi-character indication of said measured value; and
means for applying said comparison signal as a color control signal to the interconnected background color control inputs, for illuminating said background areas in a uniform color in accordance with the relation of said value of said analog signal to said analog limit.
3. A measuring device comprising:
a signal input for receiving an analog signal;
an analog comparator including a comparator input, responsive to said analog signal, for comparing the value of said analog signal with an analog limit, and a comparator output, for developing a first comparison signal when said value of said analog signal is less than said analog limit, and a second comparison signal when said value of said analog signal is greater than said analog limit;
a display device having a relatively flat display surface and including a plurality of adjacent display elements, each said display element including a plurality of light emitting diodes arranged in a pattern for exhibiting, when selectively forwardly biased, a plurality of characters;
a plurality of variable color background areas, equal in number to the number of said display elements, each said background area having a substantially flat surface aligned with said flat display surface, each said background area substantially surrounding one of said display elements and including a plurality of background regions, each said background region including a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals in said background region to obtain a light signal of a composite color;
each said background area including a first background color control input to which said first light emitting diodes in all its background regions are commonly coupled for being forwardly biased when a color control signal is applied thereto, and a second background color control input to which said second light emitting diodes in all its background regions are commonly coupled for being forwardly biased when a color control signal is applied thereto;
means for respectively interconnecting the first background color control inputs and the second background color control inputs of all said background areas;
means for measuring including a measurement input, coupled to said signal input for measuring said analog signal, and a plurality of data outputs coupled to said light emitting diodes in each said display element in accordance with their positions in said pattern, for producing selective data output signals in accordance with the measured value of said analog signal, for forwardly biasing certain ones of said light emitting diodes in each said display element, for exhibiting a multi-character indication of said measured value; and
means for applying a color control signal to the interconnected first background color control inputs when said first comparison signal is developed, for uniformly illuminating said background areas in a first color, and for applying a color control signal to the interconnected second background color control inputs when said second comparison signal is developed, for uniformly illuminating said background areas in a second color.
4. A measuring device comprising:
a signal input for receiving an analog signal;
an analog comparator including a comparator input, responsive to said analog signal, for comparing the value of said analog signal with a low analog limit and a high analog limit, and a comparator output, for developing a first comparison signal when said value of said analog signal is within said low analog limit and said high analog limit, and a second comparison signal when said value of said analog signal is not within said low analog limit and said high analog limit;
a display device having a relatively flat display surface and including a plurality of adjacent display elements, each said display element including a plurality of light emitting diodes arranged in a pattern for exhibiting, when selectively forwardly biased, a plurality of characters;
a plurality of variable color background areas, equal in number to the number of said display elements, each said background area having a substantially flat surface aligned with said flat display surface, each said background area substantially surrounding one of said display elements and including a plurality of background regions, each said background region including a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals in said background region to obtain a light signal of a composite color;
each said background area including a first background color control input to which said first light emitting diodes in all its background regions are commonly coupled for being forwardly biased when a color control signal is applied thereto, and a second background color control input to which said second light emitting diodes in all its background regions are commonly coupled for being forwardly biased when a color control signal is applied thereto;
means for respectively interconnecting the first background color control inputs and the second background color control inputs of all said background areas;
means for measuring including a measurement input, coupled to said signal input for measuring said analog signal, and a plurality of data outputs coupled to said light emitting diodes in each said display element in accordance with their positions in said pattern, for producing selective data output signals in accordance with the measured value of said analog signal, for forwardly biasing certain ones of said light emitting diodes in each said display element, for exhibiting a multi-character indication of said measured value; and
means for applying a color control signal to the interconnected first background color control inputs when said first comparison signal is developed, for uniformly illuminating said background areas in a first color, and for applying a color control signal to the interconnected second background color control inputs when said second comparison signal is developed, for uniformly illuminating said background areas in a second color.
5. A measuring device comprising:
a signal input for receiving an analog signal;
an analog comparator including a comparator input, responsive to said analog signal, for comparing the value of said analog signal with a low analog limit and a high analog limit, and a comparator output, for developing a first comparison signal when said value of said analog signal is less than said low analog limit, a second comparison signal when said value of said analog signal is within said low analog limit and said high analog limit, and a third comparison signal when said value of said analog signal is greater than said high analog limit;
a display device having a relatively flat display surface and including a plurality of adjacent display elements, each said display element including a plurality of light emitting diodes arranged in a pattern for exhibiting, when selectively forwardly biased, a plurality of characters;
a plurality of variable color background areas, equal in number to the number of said display elements, each said background area having a substantially flat surface aligned with said flat display surface, each said background area substantially surrounding one of said display elements and including a plurality of background regions, each said background region including a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, a third light emitting diode for emitting, when forwardly biased, light signals of a third primary color, and means for combining said light signals in said background region to obtain a light signal of a composite color;
each said background area including a first background color control input to which said first light emitting diodes in all its background regions are commonly coupled for being forwardly biased when a color control signal is applied thereto, a second background color control input to which said second light emitting diodes in all its background regions are commonly coupled for being forwardly biased when a color control signal is applied thereto, and a third background color control input to which said third light emitting diodes in all its background regions are commonly coupled for being forwardly biased when a color control signal is applied thereto;
means for respectively interconnecting the first background color control inputs, the second background color control inputs, and the third background color control inputs of all said background areas;
means for measuring including a measurement input, coupled to said signal input for measuring said analog signal, and a plurality of data outputs coupled to said light emitting diodes in each said display element in accordance with their positions in said pattern, for producing selective data output signals in accordance with the measured value of said analog signal, for forwardly biasing certain ones of said light emitting diodes in each said display element, for exhibiting a multi-character indication of said measured value; and
means for applying a color control signal to the interconnected first background color control inputs when said first comparison signal is developed, for uniformly illuminating said background areas in a first color, for applying a color control signal to the interconnected second background color control inputs when said second comparison signal is developed, for uniformly illuminating said background areas in a second color, and for applying a color control signal to the interconnected third background color control inputs when said third comparison signal is developed, for uniformly illuminating said background areas in a third color.
6. A measuring device comprising:
a signal input for receiving an analog signal;
an analog comparator including a comparator input, responsive to said analog signal, for comparing the value of said analog signal with an analog limit, a first comparator output, for developing an active comparison signal when said value of said analog signal is less than said analog limit, and a second comparator output, for developing an active comparison signal when said value of said analog signal is greater than said analog limit;
a display device having a relatively flat display surface and including a plurality of adjacent display elements, each said display element including a plurality of light emitting diodes arranged in a pattern for exhibiting, when selectively forwardly biased, a plurality of characters;
a plurality of variable color background areas, equal in number to the number of said display elements, each said background area having a substantially flat surface aligned with said flat display surface, each said background area substantially surrounding one of said display elements and including a plurality of background regions, each said background region including a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals in said background region to obtain a light signal of a composite color;
each said background area including a first background color control input to which said first light emitting diodes in all its background regions are commonly coupled for being forwardly biased when a color control signal is applied thereto, and a second background color control input to which said second light emitting diodes in all its background regions are commonly coupled for being forwardly biased when a color control signal is applied thereto;
means for respectively interconnecting the first background color control inputs and the second background color control inputs of all said background areas;
means for measuring including a measurement input, coupled to said signal input for measuring said analog signal, and a plurality of data outputs coupled to said light emitting diodes in each said display element in accordance with their positions in said pattern, for producing selective data output signals in accordance with the measured value of said analog signal, for forwardly biasing certain ones of said light emitting diodes in each said display element, for exhibiting a multi-character indication of said measured value; and
means for coupling said first comparator output to the interconnected first background color control inputs and said second comparator output to the interconnected second background color control inputs, for uniformly illuminating said background areas in a color in accordance with said active comparison signal.
7. A measuring device comprising:
a signal input for receiving an analog signal;
an analog comparator including a comparator input, responsive to said analog signal, for comparing the value of said analog signal with a low analog limit and a high analog limit, a first comparator output, for developing an active comparison signal when said value of said analog signal is within said low analog limit and said high analog limit, and a second comparator output, for developing an active comparison signal when said value of said analog signal is not within said low analog limit and said high analog limit;
a display device having a relatively flat display surface and including a plurality of adjacent display elements, each said display element including a plurality of light emitting diodes arranged in a pattern for exhibiting, when selectively forwardly biased, a plurality of characters;
a plurality of variable color background areas, equal in number to the number of said display elements, each said background area having a substantially flat surface aligned with said flat display surface, each said background area substantially surrounding one of said display elements and including a plurality of background regions, each said background region including a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, and means for combining said light signals in said background region to obtain a light signal of a composite color;
each said background area including a first background color control input to which said first light emitting diodes in all its background regions are commonly coupled for being forwardly biased when a color control signal is applied thereto, and a second background color control input to which said second light emitting diodes in all its background regions are commonly coupled for being forwardly biased when a color control signal is applied thereto;
means for respectively interconnecting the first background color control inputs and the second background color control inputs of all said background areas;
means for measuring including a measurement input, coupled to said signal input for measuring said analog signal, and a plurality of data outputs coupled to said light emitting diodes in each said display element in accordance with their positions in said pattern, for producing selective data output signals in accordance with the measured value of said analog signal, for forwardly biasing certain ones of said light emitting diodes in each said display element, for exhibiting a multi-character indication of said measured value; and
means for coupling said first comparator output to the interconnected first background color control inputs and said second comparator output to the interconnected second background color control inputs, for uniformly illuminating said background areas in a color in accordance with said active comparison signal.
8. A measuring device comprising:
a signal input for receiving an analog signal;
an analog comparator including a comparator input, responsive to said analog signal, for comparing the value of said analog signal with a low analog limit and a high analog limit, a first comparator output, for developing an active comparison signal when said value of said analog signal is less than said low analog limit, a second comparator output, for developing an active comparison signal when said value of said analog signal is within said low analog limit and said high analog limit, and a third comparator output, for developing an active comparison signal when said value of said analog signal is greater than said high analog limit;
a display device having a relatively flat display surface and including a plurality of adjacent display elements, each said display element including a plurality of light emitting diodes arranged in a pattern for exhibiting, when selectively forwardly biased, a plurality of characters;
a plurality of variable color background areas, equal in number to the number of said display elements, each said background area having a substantially flat surface aligned with said flat display surface, each said background area substantially surrounding one of said display elements and including a plurality of background regions, each said background region including a first light emitting diode for emitting, when forwardly biased, light signals of a first primary color, a second light emitting diode for emitting, when forwardly biased, light signals of a second primary color, a third light emitting diode for emitting, when forwardly biased, light signals of a third primary color, and means for combining said light signals in said background region to obtain a light signal of a composite color;
each said background area including a first background color control input to which said first light emitting diodes in all its background regions are commonly coupled for being forwardly biased when a color control signal is applied thereto, a second background color control input to which said second light emitting diodes in all its background regions are commonly coupled for being forwardly biased when a color control signal is applied thereto, and a third background color control input to which said third light emitting diodes in all its background regions are commonly coupled for being forwardly biased when a color control signal is applied thereto;
means for respectively interconnecting the first background color control inputs, the second background color control inputs, and the third background color control inputs of all said background areas;
means for measuring including a measurement input, coupled to said signal input for measuring said analog signal, and a plurality of data outputs coupled to said light emitting diodes in each said display element in accordance with their positions in said pattern, for producing selective data output signals in accordance with the measured value of said analog signal, for forwardly biasing certain ones of said light emitting diodes in each said display element, for exhibiting a multi-character indication of said measured value; and
means for coupling said first comparator output to the interconnected first background color control inputs, said second comparator output to the interconnected second background color control inputs, and said third comparator output to the interconnected third background color control inputs, for uniformly illuminating said background areas in a color in accordance with said active comparison signal.
US09335551 1986-07-07 1999-06-18 Variable color digital voltmeter with analog comparator Expired - Fee Related US6147483A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US06882430 US4734619A (en) 1986-07-07 1986-07-07 Display device with variable color background
US06940100 US4831326A (en) 1986-12-10 1986-12-10 Digital voltmeter with variable color background
US33741089 true 1989-04-13 1989-04-13
US07528229 US5057768A (en) 1986-07-07 1990-05-24 Measuring device with variable color display
US76779291 true 1991-09-30 1991-09-30
US9941193 true 1993-07-30 1993-07-30
US08422090 US5561365A (en) 1986-07-07 1995-03-31 Digital color display system
US08721719 US5963185A (en) 1986-07-07 1996-09-27 Display device with variable color background area
US09335551 US6147483A (en) 1986-07-07 1999-06-18 Variable color digital voltmeter with analog comparator

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US09335551 US6147483A (en) 1986-07-07 1999-06-18 Variable color digital voltmeter with analog comparator

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US08721719 Division US5963185A (en) 1986-01-15 1996-09-27 Display device with variable color background area

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US6147483A true US6147483A (en) 2000-11-14

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US08422090 Expired - Fee Related US5561365A (en) 1986-01-15 1995-03-31 Digital color display system
US08721719 Expired - Fee Related US5963185A (en) 1986-01-15 1996-09-27 Display device with variable color background area
US09093261 Expired - Fee Related US6121944A (en) 1986-07-07 1998-06-08 Method of indicating and evaluating measured value
US09093518 Abandoned US20020000956A1 (en) 1986-07-07 1998-06-08 Display device for evaluating displayed value
US09136110 Expired - Fee Related US6219014B1 (en) 1986-07-07 1998-08-18 Variable color display device having display area and background area
US09335551 Expired - Fee Related US6147483A (en) 1986-07-07 1999-06-18 Variable color digital voltmeter with analog comparator
US09812970 Expired - Fee Related US6690343B2 (en) 1986-07-07 2001-03-20 Display device with variable color background for evaluating displayed value

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US08422090 Expired - Fee Related US5561365A (en) 1986-01-15 1995-03-31 Digital color display system
US08721719 Expired - Fee Related US5963185A (en) 1986-01-15 1996-09-27 Display device with variable color background area
US09093261 Expired - Fee Related US6121944A (en) 1986-07-07 1998-06-08 Method of indicating and evaluating measured value
US09093518 Abandoned US20020000956A1 (en) 1986-07-07 1998-06-08 Display device for evaluating displayed value
US09136110 Expired - Fee Related US6219014B1 (en) 1986-07-07 1998-08-18 Variable color display device having display area and background area

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6414662B1 (en) 1999-10-12 2002-07-02 Texas Digital Systems, Inc. Variable color complementary display device using anti-parallel light emitting diodes
US6424327B2 (en) 1986-01-15 2002-07-23 Texas Digital Systems, Inc. Multicolor display element with enable input
US6690343B2 (en) 1986-07-07 2004-02-10 Texas Digital Systems, Inc. Display device with variable color background for evaluating displayed value
US6734837B1 (en) 1986-01-15 2004-05-11 Texas Digital Systems, Inc. Variable color display system for comparing exhibited value with limit
US20050099203A1 (en) * 2003-09-02 2005-05-12 Samsung Electronics Co., Ltd. Voltage apparatus in a semiconductor probe station
CN102339582A (en) * 2010-07-21 2012-02-01 鸿富锦精密工业(深圳)有限公司 Indicator light control device
US8248261B1 (en) * 2008-06-10 2012-08-21 Williams-Pyro Inc. Method and system for a digital voltage detector with digital voltage display
US20120256754A1 (en) * 2011-04-11 2012-10-11 Wolfgang Hoeft Monitoring device for an ungrounded power network of a photovoltaic system
US20130257624A1 (en) * 2012-03-28 2013-10-03 International Business Machines Corporation Visually detecting electrostatic discharge events

Families Citing this family (83)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0831451A3 (en) * 1996-09-06 1998-04-22 Matsushita Electric Industrial Co., Ltd. Colour display using LEDs
US7038398B1 (en) * 1997-08-26 2006-05-02 Color Kinetics, Incorporated Kinetic illumination system and methods
US6717376B2 (en) 1997-08-26 2004-04-06 Color Kinetics, Incorporated Automotive information systems
US7764026B2 (en) 1997-12-17 2010-07-27 Philips Solid-State Lighting Solutions, Inc. Systems and methods for digital entertainment
US20040052076A1 (en) 1997-08-26 2004-03-18 Mueller George G. Controlled lighting methods and apparatus
US7303300B2 (en) 2000-09-27 2007-12-04 Color Kinetics Incorporated Methods and systems for illuminating household products
US6528954B1 (en) 1997-08-26 2003-03-04 Color Kinetics Incorporated Smart light bulb
US6608453B2 (en) 1997-08-26 2003-08-19 Color Kinetics Incorporated Methods and apparatus for controlling devices in a networked lighting system
US6774584B2 (en) 1997-08-26 2004-08-10 Color Kinetics, Incorporated Methods and apparatus for sensor responsive illumination of liquids
US20030206411A9 (en) 1997-08-26 2003-11-06 Dowling Kevin J. Light-emitting diode based products
US6211626B1 (en) 1997-08-26 2001-04-03 Color Kinetics, Incorporated Illumination components
US6624597B2 (en) 1997-08-26 2003-09-23 Color Kinetics, Inc. Systems and methods for providing illumination in machine vision systems
US7064498B2 (en) * 1997-08-26 2006-06-20 Color Kinetics Incorporated Light-emitting diode based products
US6801003B2 (en) 2001-03-13 2004-10-05 Color Kinetics, Incorporated Systems and methods for synchronizing lighting effects
US6777891B2 (en) 1997-08-26 2004-08-17 Color Kinetics, Incorporated Methods and apparatus for controlling devices in a networked lighting system
US6548967B1 (en) 1997-08-26 2003-04-15 Color Kinetics, Inc. Universal lighting network methods and systems
US6781329B2 (en) 1997-08-26 2004-08-24 Color Kinetics Incorporated Methods and apparatus for illumination of liquids
US6597360B1 (en) 1998-10-07 2003-07-22 Microsoft Corporation Automatic optimization of the position of stems of text characters
US6396505B1 (en) * 1998-10-07 2002-05-28 Microsoft Corporation Methods and apparatus for detecting and reducing color errors in images
US6236390B1 (en) 1998-10-07 2001-05-22 Microsoft Corporation Methods and apparatus for positioning displayed characters
US6356278B1 (en) 1998-10-07 2002-03-12 Microsoft Corporation Methods and systems for asymmeteric supersampling rasterization of image data
US6278434B1 (en) 1998-10-07 2001-08-21 Microsoft Corporation Non-square scaling of image data to be mapped to pixel sub-components
US6188385B1 (en) 1998-10-07 2001-02-13 Microsoft Corporation Method and apparatus for displaying images such as text
US6393145B2 (en) 1999-01-12 2002-05-21 Microsoft Corporation Methods apparatus and data structures for enhancing the resolution of images to be rendered on patterned display devices
US6973210B1 (en) 1999-01-12 2005-12-06 Microsoft Corporation Filtering image data to obtain samples mapped to pixel sub-components of a display device
US7134091B2 (en) * 1999-02-01 2006-11-07 Microsoft Corporation Quality of displayed images with user preference information
US6750875B1 (en) 1999-02-01 2004-06-15 Microsoft Corporation Compression of image data associated with two-dimensional arrays of pixel sub-components
US6624828B1 (en) 1999-02-01 2003-09-23 Microsoft Corporation Method and apparatus for improving the quality of displayed images through the use of user reference information
US6738526B1 (en) 1999-07-30 2004-05-18 Microsoft Corporation Method and apparatus for filtering and caching data representing images
US6282327B1 (en) 1999-07-30 2001-08-28 Microsoft Corporation Maintaining advance widths of existing characters that have been resolution enhanced
US6226017B1 (en) 1999-07-30 2001-05-01 Microsoft Corporation Methods and apparatus for improving read/modify/write operations
US20030133292A1 (en) 1999-11-18 2003-07-17 Mueller George G. Methods and apparatus for generating and modulating white light illumination conditions
US7049761B2 (en) 2000-02-11 2006-05-23 Altair Engineering, Inc. Light tube and power supply circuit
JP2004503669A (en) 2000-07-13 2004-02-05 ザ プロクター アンド ギャンブル カンパニー Multilayer reaction mixture and a device for emitting volatile components through the exothermic reaction to be controlled
US7088321B1 (en) * 2001-03-30 2006-08-08 Infocus Corporation Method and apparatus for driving LED light sources for a projection display
US6958384B2 (en) * 2002-03-15 2005-10-25 Wisconsin Alumni Research Foundation Polypeptides containing γ-amino acids
US7079452B2 (en) * 2002-04-16 2006-07-18 Harrison Shelton E Time display system, method and device
CN1242299C (en) * 2002-05-29 2006-02-15 希毕克斯影像有限公司 Electrophoretic display system
US7064354B2 (en) * 2003-01-02 2006-06-20 Epitech Technology Corporation Color mixing light emitting diode
US7178941B2 (en) 2003-05-05 2007-02-20 Color Kinetics Incorporated Lighting methods and systems
JP4587170B2 (en) 2005-01-20 2010-11-24 キヤノン株式会社 Manufacturing method for an exposure apparatus and device
US20060239127A1 (en) * 2005-04-22 2006-10-26 Tey-Jen Wu Multifunctional desk-top inductive clock
FR2885721B1 (en) * 2005-05-13 2007-07-13 Johnson Controls Tech Co A display device has diversified illumination color by light conduit
JP5383010B2 (en) * 2007-08-08 2014-01-08 セミコンダクター・コンポーネンツ・インダストリーズ・リミテッド・ライアビリティ・カンパニー Led drive circuit
US8118447B2 (en) 2007-12-20 2012-02-21 Altair Engineering, Inc. LED lighting apparatus with swivel connection
US7712918B2 (en) 2007-12-21 2010-05-11 Altair Engineering , Inc. Light distribution using a light emitting diode assembly
US8360599B2 (en) 2008-05-23 2013-01-29 Ilumisys, Inc. Electric shock resistant L.E.D. based light
US7976196B2 (en) 2008-07-09 2011-07-12 Altair Engineering, Inc. Method of forming LED-based light and resulting LED-based light
US7946729B2 (en) 2008-07-31 2011-05-24 Altair Engineering, Inc. Fluorescent tube replacement having longitudinally oriented LEDs
US8674626B2 (en) 2008-09-02 2014-03-18 Ilumisys, Inc. LED lamp failure alerting system
US8256924B2 (en) 2008-09-15 2012-09-04 Ilumisys, Inc. LED-based light having rapidly oscillating LEDs
US8653984B2 (en) 2008-10-24 2014-02-18 Ilumisys, Inc. Integration of LED lighting control with emergency notification systems
US8324817B2 (en) 2008-10-24 2012-12-04 Ilumisys, Inc. Light and light sensor
US8901823B2 (en) 2008-10-24 2014-12-02 Ilumisys, Inc. Light and light sensor
US8444292B2 (en) 2008-10-24 2013-05-21 Ilumisys, Inc. End cap substitute for LED-based tube replacement light
US8214084B2 (en) 2008-10-24 2012-07-03 Ilumisys, Inc. Integration of LED lighting with building controls
US7938562B2 (en) 2008-10-24 2011-05-10 Altair Engineering, Inc. Lighting including integral communication apparatus
US8556452B2 (en) 2009-01-15 2013-10-15 Ilumisys, Inc. LED lens
US8664880B2 (en) 2009-01-21 2014-03-04 Ilumisys, Inc. Ballast/line detection circuit for fluorescent replacement lamps
US8362710B2 (en) 2009-01-21 2013-01-29 Ilumisys, Inc. Direct AC-to-DC converter for passive component minimization and universal operation of LED arrays
US9460666B2 (en) * 2009-05-11 2016-10-04 E Ink California, Llc Driving methods and waveforms for electrophoretic displays
US8330381B2 (en) 2009-05-14 2012-12-11 Ilumisys, Inc. Electronic circuit for DC conversion of fluorescent lighting ballast
US8299695B2 (en) 2009-06-02 2012-10-30 Ilumisys, Inc. Screw-in LED bulb comprising a base having outwardly projecting nodes
CA2669367A1 (en) * 2009-06-16 2010-12-16 Ignis Innovation Inc Compensation technique for color shift in displays
US8421366B2 (en) 2009-06-23 2013-04-16 Ilumisys, Inc. Illumination device including LEDs and a switching power control system
US8540401B2 (en) 2010-03-26 2013-09-24 Ilumisys, Inc. LED bulb with internal heat dissipating structures
CA2794512A1 (en) 2010-03-26 2011-09-29 David L. Simon Led light tube with dual sided light distribution
CA2792940A1 (en) 2010-03-26 2011-09-19 Ilumisys, Inc. Led light with thermoelectric generator
US8454193B2 (en) 2010-07-08 2013-06-04 Ilumisys, Inc. Independent modules for LED fluorescent light tube replacement
CA2803267A1 (en) 2010-07-12 2012-01-19 Ilumisys, Inc. Circuit board mount for led light tube
US8523394B2 (en) 2010-10-29 2013-09-03 Ilumisys, Inc. Mechanisms for reducing risk of shock during installation of light tube
US8870415B2 (en) 2010-12-09 2014-10-28 Ilumisys, Inc. LED fluorescent tube replacement light with reduced shock hazard
US9072171B2 (en) 2011-08-24 2015-06-30 Ilumisys, Inc. Circuit board mount for LED light
US9184518B2 (en) 2012-03-02 2015-11-10 Ilumisys, Inc. Electrical connector header for an LED-based light
US9163794B2 (en) 2012-07-06 2015-10-20 Ilumisys, Inc. Power supply assembly for LED-based light tube
US9271367B2 (en) 2012-07-09 2016-02-23 Ilumisys, Inc. System and method for controlling operation of an LED-based light
US9285084B2 (en) 2013-03-14 2016-03-15 Ilumisys, Inc. Diffusers for LED-based lights
CN103544887B (en) * 2013-09-29 2016-03-02 长春希达电子技术有限公司 Surface smooth, uniform color mosaic display module led by the display unit
US9267650B2 (en) 2013-10-09 2016-02-23 Ilumisys, Inc. Lens for an LED-based light
US9574717B2 (en) 2014-01-22 2017-02-21 Ilumisys, Inc. LED-based light with addressed LEDs
DE102014104657A1 (en) * 2014-04-02 2015-10-08 Eaton Electrical Ip Gmbh & Co. Kg Display device with a wireless interface and an interface to a bus system of a networked control system
CN103915045A (en) * 2014-04-23 2014-07-09 广东威创视讯科技股份有限公司 Display and method for manufacturing same
US9510400B2 (en) 2014-05-13 2016-11-29 Ilumisys, Inc. User input systems for an LED-based light

Citations (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2643344A (en) * 1950-01-10 1953-06-23 Bendix Aviat Corp System for measuring radioactivity
US2648015A (en) * 1951-05-31 1953-08-04 Bendix Aviat Corp System for measuring radioactivity
US2682000A (en) * 1951-05-31 1954-06-22 Bendix Aviat Corp System for measuring radioactivity
US2878450A (en) * 1957-05-23 1959-03-17 Marquardt Aircraft Co High speed multi-channel voltage indicator
US2889518A (en) * 1954-09-15 1959-06-02 Hymac Corp Digital meter
US3559059A (en) * 1968-07-12 1971-01-26 Space Corp Force indicating system
US3595991A (en) * 1968-07-11 1971-07-27 Calvin D Diller Color display apparatus utilizing light-emitting diodes
US3719849A (en) * 1971-09-24 1973-03-06 Hewlett Packard Co Solid state displays
US3740570A (en) * 1971-09-27 1973-06-19 Litton Systems Inc Driving circuits for light emitting diodes
US3760174A (en) * 1972-05-31 1973-09-18 Westinghouse Electric Corp Programmable light source
US3771155A (en) * 1970-09-09 1973-11-06 Hitachi Ltd Color display system
US3840873A (en) * 1972-04-14 1974-10-08 S Usui Alpha-numeric character display device
US3873979A (en) * 1973-09-28 1975-03-25 Monsanto Co Luminescent solid state status indicator
US3911418A (en) * 1969-10-08 1975-10-07 Matsushita Electric Ind Co Ltd Method and apparatus for independent color control of alphanumeric display and background therefor
US3924227A (en) * 1972-11-13 1975-12-02 Michael Stolov Digital display device
US3975726A (en) * 1973-05-23 1976-08-17 Hitachi, Ltd. Method and device for driving in time division fashion field effect mode liquid crystal display device for numeric display
US3978849A (en) * 1975-04-17 1976-09-07 International Telephone And Telegraph Corporation Pulse rate indicator
US4086514A (en) * 1975-09-15 1978-04-25 Karel Havel Variable color display device
DE3037500A1 (en) * 1979-10-06 1981-04-23 Zettler Elektro Apparate Ag LED array to display large structures
US4271408A (en) * 1978-10-17 1981-06-02 Stanley Electric Co., Ltd. Colored-light emitting display
DE3009416A1 (en) * 1980-03-12 1981-09-17 Licentia Gmbh Multi-colour LED display for seven segment figures - is used in calculators or measuring instruments and employs transistor or direct switching without supply voltage polarity change
US4301450A (en) * 1980-02-04 1981-11-17 Burroughs Corporation Error detection for multi-segmented indicia display
JPS57146112A (en) * 1981-03-04 1982-09-09 Rhythm Watch Co Ltd Multicolor indicator for measuring device
US4360804A (en) * 1979-04-10 1982-11-23 Nippon Electric Co., Ltd. Pattern display system
US4488149A (en) * 1981-02-26 1984-12-11 Givens Jr William A Electronic display having segments wherein each segment is capable of selectively illuminating two colors
GB2158631A (en) * 1984-04-06 1985-11-13 Comtronic Gmbh Optical display apparatus
US4559480A (en) * 1982-11-15 1985-12-17 Omega Sa Color matrix display with discharge tube light emitting elements
US4581612A (en) * 1982-03-29 1986-04-08 Smiths Industries Public Limited Company Display with matrix array of elements
US4647217A (en) * 1986-01-08 1987-03-03 Karel Havel Variable color digital timepiece
US4689613A (en) * 1984-06-06 1987-08-25 Hitachi, Ltd. Character and pattern display system
US4709230A (en) * 1985-04-19 1987-11-24 Questron, Inc. Color converter
US4712099A (en) * 1983-06-13 1987-12-08 Sony Corporation Color-signal converting circuit
US4720709A (en) * 1983-01-13 1988-01-19 Matsushita Electric Industrial Co., Ltd. Color display system utilizing a matrix arrangement of triads
US4725828A (en) * 1984-02-15 1988-02-16 International Business Machines Corporation Color display apparatus and method of coding a color image
US4740818A (en) * 1985-12-16 1988-04-26 Eastman Kodak Company Electrophotographic reproduction apparatus and method with selective screening
US4771274A (en) * 1986-01-08 1988-09-13 Karel Havel Variable color digital display device
US4794383A (en) * 1986-01-15 1988-12-27 Karel Havel Variable color digital multimeter
US4831326A (en) * 1986-12-10 1989-05-16 Karel Havel Digital voltmeter with variable color background
US5003298A (en) * 1986-01-15 1991-03-26 Karel Havel Variable color digital display for emphasizing position of decimal point

Family Cites Families (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3590156A (en) 1968-08-28 1971-06-29 Zenith Radio Corp Flat panel display system with time-modulated gray scale
US3696393A (en) 1971-05-10 1972-10-03 Hughes Aircraft Co Analog display using light emitting diodes
US3771015A (en) 1972-02-09 1973-11-06 Beckman Instruments Inc Light-emitting diode display
JPS48102585A (en) 1972-04-04 1973-12-22
US3911430A (en) 1974-04-17 1975-10-07 Fairchild Camera Instr Co Alpha-numeric display package
US3947840A (en) 1974-08-16 1976-03-30 Monsanto Company Integrated semiconductor light-emitting display array
US3987401A (en) 1974-12-31 1976-10-19 Motorola, Inc. Indicating system using multicolor light emitting diodes
US4201039A (en) * 1977-06-06 1980-05-06 General Electric Company Numerical display using plural light sources and having a reduced and substantially constant current requirement
US4155084A (en) * 1977-09-08 1979-05-15 The United States Of America As Represented By The Secretary Of The Navy Solid state LED display device
DE2904914C2 (en) * 1978-02-17 1990-04-19 Smiths Industries Plc, London, Gb
US4232312A (en) 1978-03-06 1980-11-04 Smiths Industries Limited Analogue electrical indicators having a series of electrically-energizable elements
US4204424A (en) 1979-01-08 1980-05-27 Phillips Petroleum Company Chromatographic analyzer detector gain adjustment
DE3008565A1 (en) 1980-03-06 1981-09-17 Licentia Gmbh Arrangement for the display of information with light-emitting diodes
JPS612949B2 (en) * 1980-06-13 1986-01-29 Tokyo Shibaura Electric Co
JPS57146122A (en) 1981-03-04 1982-09-09 Ricoh Co Ltd Discriminating method for intermediate tone region
FR2512294A1 (en) 1981-08-31 1983-03-04 Thomson Brandt Receiver comprising a frequency display device
US5184114A (en) * 1982-11-04 1993-02-02 Integrated Systems Engineering, Inc. Solid state color display system and light emitting diode pixels therefor
US4525729A (en) 1983-04-04 1985-06-25 Polaroid Corporation Parallel LED exposure control system
US4788535A (en) 1983-11-10 1988-11-29 Matsushita Electric Industrial Co., Ltd. Display apparatus
US4644342A (en) * 1984-03-29 1987-02-17 Eastman Kodak Company Array of light emitting diodes for producing gray scale light images
US4723119A (en) 1984-05-07 1988-02-02 Futaba Denshi Kogyo Kabushiki Kaisha Large-sized color display device
GB8412434D0 (en) 1984-05-16 1984-06-20 Ici Plc Coating compositions
EP0182254B1 (en) 1984-11-12 1994-03-09 Takiron Co. Ltd. Dot matrix luminous display
FR2579807B1 (en) * 1985-03-26 1987-12-18 Radiotechnique Compelec coloree luminous sign for displaying information
US4845481A (en) 1986-01-08 1989-07-04 Karel Havel Continuously variable color display device
US5561365A (en) * 1986-07-07 1996-10-01 Karel Havel Digital color display system
US5122733A (en) 1986-01-15 1992-06-16 Karel Havel Variable color digital multimeter
US5057768A (en) * 1986-07-07 1991-10-15 Karel Havel Measuring device with variable color display
US4837565A (en) 1987-08-13 1989-06-06 Digital Equipment Corporation Tri-state function indicator

Patent Citations (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2643344A (en) * 1950-01-10 1953-06-23 Bendix Aviat Corp System for measuring radioactivity
US2648015A (en) * 1951-05-31 1953-08-04 Bendix Aviat Corp System for measuring radioactivity
US2682000A (en) * 1951-05-31 1954-06-22 Bendix Aviat Corp System for measuring radioactivity
US2889518A (en) * 1954-09-15 1959-06-02 Hymac Corp Digital meter
US2878450A (en) * 1957-05-23 1959-03-17 Marquardt Aircraft Co High speed multi-channel voltage indicator
US3595991A (en) * 1968-07-11 1971-07-27 Calvin D Diller Color display apparatus utilizing light-emitting diodes
US3559059A (en) * 1968-07-12 1971-01-26 Space Corp Force indicating system
US3911418A (en) * 1969-10-08 1975-10-07 Matsushita Electric Ind Co Ltd Method and apparatus for independent color control of alphanumeric display and background therefor
US3771155A (en) * 1970-09-09 1973-11-06 Hitachi Ltd Color display system
US3719849A (en) * 1971-09-24 1973-03-06 Hewlett Packard Co Solid state displays
US3740570A (en) * 1971-09-27 1973-06-19 Litton Systems Inc Driving circuits for light emitting diodes
US3840873A (en) * 1972-04-14 1974-10-08 S Usui Alpha-numeric character display device
US3760174A (en) * 1972-05-31 1973-09-18 Westinghouse Electric Corp Programmable light source
US3924227A (en) * 1972-11-13 1975-12-02 Michael Stolov Digital display device
US3975726A (en) * 1973-05-23 1976-08-17 Hitachi, Ltd. Method and device for driving in time division fashion field effect mode liquid crystal display device for numeric display
US3873979A (en) * 1973-09-28 1975-03-25 Monsanto Co Luminescent solid state status indicator
US3978849A (en) * 1975-04-17 1976-09-07 International Telephone And Telegraph Corporation Pulse rate indicator
US4086514A (en) * 1975-09-15 1978-04-25 Karel Havel Variable color display device
US4271408A (en) * 1978-10-17 1981-06-02 Stanley Electric Co., Ltd. Colored-light emitting display
US4360804A (en) * 1979-04-10 1982-11-23 Nippon Electric Co., Ltd. Pattern display system
DE3037500A1 (en) * 1979-10-06 1981-04-23 Zettler Elektro Apparate Ag LED array to display large structures
US4301450A (en) * 1980-02-04 1981-11-17 Burroughs Corporation Error detection for multi-segmented indicia display
DE3009416A1 (en) * 1980-03-12 1981-09-17 Licentia Gmbh Multi-colour LED display for seven segment figures - is used in calculators or measuring instruments and employs transistor or direct switching without supply voltage polarity change
US4488149A (en) * 1981-02-26 1984-12-11 Givens Jr William A Electronic display having segments wherein each segment is capable of selectively illuminating two colors
JPS57146112A (en) * 1981-03-04 1982-09-09 Rhythm Watch Co Ltd Multicolor indicator for measuring device
US4581612A (en) * 1982-03-29 1986-04-08 Smiths Industries Public Limited Company Display with matrix array of elements
US4559480A (en) * 1982-11-15 1985-12-17 Omega Sa Color matrix display with discharge tube light emitting elements
US4720709A (en) * 1983-01-13 1988-01-19 Matsushita Electric Industrial Co., Ltd. Color display system utilizing a matrix arrangement of triads
US4712099A (en) * 1983-06-13 1987-12-08 Sony Corporation Color-signal converting circuit
US4725828A (en) * 1984-02-15 1988-02-16 International Business Machines Corporation Color display apparatus and method of coding a color image
GB2158631A (en) * 1984-04-06 1985-11-13 Comtronic Gmbh Optical display apparatus
US4689613A (en) * 1984-06-06 1987-08-25 Hitachi, Ltd. Character and pattern display system
US4709230A (en) * 1985-04-19 1987-11-24 Questron, Inc. Color converter
US4740818A (en) * 1985-12-16 1988-04-26 Eastman Kodak Company Electrophotographic reproduction apparatus and method with selective screening
US4647217A (en) * 1986-01-08 1987-03-03 Karel Havel Variable color digital timepiece
US4771274A (en) * 1986-01-08 1988-09-13 Karel Havel Variable color digital display device
US4794383A (en) * 1986-01-15 1988-12-27 Karel Havel Variable color digital multimeter
US5003298A (en) * 1986-01-15 1991-03-26 Karel Havel Variable color digital display for emphasizing position of decimal point
US4831326A (en) * 1986-12-10 1989-05-16 Karel Havel Digital voltmeter with variable color background

Non-Patent Citations (25)

* Cited by examiner, † Cited by third party
Title
Baker, M., "Chip changes the color of light-emitting diodes", Electronics, Apr. 7, 1981, pp. 158-159.
Baker, M., Chip changes the color of light emitting diodes , Electronics, Apr. 7, 1981, pp. 158 159. *
Kojima, T. "Recent flat panel development in Japan", held in San Diego, CA, Apr. 29-May 1, 1980. SID 80 Digest, pp. 22-23.
Kojima, T. Recent flat panel development in Japan , held in San Diego, CA, Apr. 29 May 1, 1980. SID 80 Digest, pp. 22 23. *
Landauer, R. W., "Electroluminescent Display", IBM Technical Disclosure Bulletin, vol. 8, No. 11, pp. 15-16, Apr. 11, 1966.
Landauer, R. W., Electroluminescent Display , IBM Technical Disclosure Bulletin, vol. 8, No. 11, pp. 15 16, Apr. 11, 1966. *
Niina, T. et al, "A multi-color GaP LED flat panel display device" New York, NY, USA, Apr. 28-30, 1981. 1981 SID International Symposium Digest of Papers, vol. XII (1981), pp. 140-141.
Niina, T. et al, "A multi-color LED flat panel display device for colorful displays of letters and figures". Proceedings of the SID, vol. 23, No. 2, pp. 73-76, (month unavailable) 1982.
Niina, T. et al, A multi color GaP LED flat panel display device New York, NY, USA, Apr. 28 30, 1981. 1981 SID International Symposium Digest of Papers, vol. XII (1981), pp. 140 141. *
Niina, T. et al, A multi color LED flat panel display device for colorful displays of letters and figures . Proceedings of the SID, vol. 23, No. 2, pp. 73 76, (month unavailable) 1982. *
O Mara, P.A. et al, Microprocessor controlled light emitting diode dark adaptometer . Medical & Biological Engineering and Computing, vol. 20, No. 1, pp. 70 76, Jan. 1982. *
O'Mara, P.A. et al, "Microprocessor-controlled light-emitting diode dark adaptometer". Medical & Biological Engineering and Computing, vol. 20, No. 1, pp. 70-76, Jan. 1982.
Rao, V., Two LEDs blend and blink to indicate six states. Electronic Design, vol. 30, No. 16, pp. 220, Aug. 5, 1982. *
Saitoh, T. et al. "Multicolor light-emitting diodes with double junction structure". IEEE Transactions on Electron Devices, Feb. 1975, vol. ED-22, No. 2, pp. 29-32.
Saitoh, T. et al. Multicolor light emitting diodes with double junction structure . IEEE Transactions on Electron Devices, Feb. 1975, vol. ED 22, No. 2, pp. 29 32. *
SenSym Solid State Barometers Catalog, p. 9 30, 1983. *
SenSym Solid State Barometers Catalog, p. 9-30, 1983.
Smithline, L.M., "Dual light emitting diode synthesizes polychromatic light", Electronics, Aug. 16, 1979, p. 130.
Smithline, L.M., Dual light emitting diode synthesizes polychromatic light , Electronics, Aug. 16, 1979, p. 130. *
Svestka, M. et al, "LEDs change color to indicate balance voltage", Electronic Engineering, vol. 48, No. 576, p. 19, Feb. 1976.
Svestka, M. et al, LEDs change color to indicate balance voltage , Electronic Engineering, vol. 48, No. 576, p. 19, Feb. 1976. *
Wagner, B., "2-color LED+Driver=Versatile Visual Effects", EDN vol. 25, No. 19, Oct. 20, 1980.
Wagner, B., 2 color LED Driver Versatile Visual Effects , EDN vol. 25, No. 19, Oct. 20, 1980. *
Yamaguchi, T. et al, "A High Brightness Gap Multicolor LED", IEEE Transactions on Electron Devices, vol. ED-28, No. 5, May 1981, pp. 588-592.
Yamaguchi, T. et al, A High Brightness Gap Multicolor LED , IEEE Transactions on Electron Devices, vol. ED 28, No. 5, May 1981, pp. 588 592. *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6424327B2 (en) 1986-01-15 2002-07-23 Texas Digital Systems, Inc. Multicolor display element with enable input
US6535186B1 (en) 1986-01-15 2003-03-18 Texas Digital Systems, Inc. Multicolor display element
US6577287B2 (en) 1986-01-15 2003-06-10 Texas Digital Systems, Inc. Dual variable color display device
US6734837B1 (en) 1986-01-15 2004-05-11 Texas Digital Systems, Inc. Variable color display system for comparing exhibited value with limit
US6690343B2 (en) 1986-07-07 2004-02-10 Texas Digital Systems, Inc. Display device with variable color background for evaluating displayed value
US6414662B1 (en) 1999-10-12 2002-07-02 Texas Digital Systems, Inc. Variable color complementary display device using anti-parallel light emitting diodes
US20050099203A1 (en) * 2003-09-02 2005-05-12 Samsung Electronics Co., Ltd. Voltage apparatus in a semiconductor probe station
US7227372B2 (en) * 2003-09-02 2007-06-05 Samsung Electronics Co., Ltd. Voltage monitoring apparatus in a semiconductor probe station
US8446286B2 (en) 2008-06-10 2013-05-21 Williams-Pyro, Inc. Method and system for a digital voltage detector with digital voltage display for armament circuit testing
US8248261B1 (en) * 2008-06-10 2012-08-21 Williams-Pyro Inc. Method and system for a digital voltage detector with digital voltage display
CN102339582A (en) * 2010-07-21 2012-02-01 鸿富锦精密工业(深圳)有限公司 Indicator light control device
US20120256754A1 (en) * 2011-04-11 2012-10-11 Wolfgang Hoeft Monitoring device for an ungrounded power network of a photovoltaic system
CN103650277A (en) * 2011-04-11 2014-03-19 菲尼克斯电气公司 Monitoring device for an isolated network of a photovoltaic system
US8952825B2 (en) * 2011-04-11 2015-02-10 Phoenix Contact Gmbh & Co. Kg Monitoring device for an ungrounded power network of a photovoltaic system
CN103650277B (en) * 2011-04-11 2016-12-28 菲尼克斯电气公司 Insulation structure for a photovoltaic power system monitoring device, the photovoltaic system and method of operation
US20130257624A1 (en) * 2012-03-28 2013-10-03 International Business Machines Corporation Visually detecting electrostatic discharge events
US9105573B2 (en) * 2012-03-28 2015-08-11 International Business Machines Corporation Visually detecting electrostatic discharge events
US9711422B2 (en) 2012-03-28 2017-07-18 Globalfoundries Inc. Visually detecting electrostatic discharge events

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US5561365A (en) 1996-10-01 grant
US20010015708A1 (en) 2001-08-23 application
US5963185A (en) 1999-10-05 grant
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US6219014B1 (en) 2001-04-17 grant

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Owner name: TEXAS DIGITAL SYSTEMS, INC., TEXAS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HAVEL, KAREL;REEL/FRAME:010135/0887

Effective date: 19990607

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Expired due to failure to pay maintenance fee

Effective date: 20041114